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Dell XPS 13 Developer Edition - Battery stops charging at 83%

Hi, i have an XPS 13 Developer Edition (so with Ubuntu 14.04), about 4 months old, probably a bit less, and suddenly i have this problem: as soon as the battery percentage reaches 83%, the status switches to "discharging", the led on the front turns off, and turns back on only as soon as a little percentage of battery gets consumed; this on-off cycle goes on and on, as the laptop thinks he is fully charged at 83%. I'm sure it's not just a wrong shown percentage problem, like it shows 83% but it's actually 100%, since the battery does last just exactly as it did with 80%, and not like 100%. 

What can i do to solve this problem? 

Thank you

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